WO2020134978A1

WO2020134978A1 - Battery module

Info

Publication number: WO2020134978A1
Application number: PCT/CN2019/123693
Authority: WO
Inventors: 陈少镇; 苏立擂; 郑仁蔚; 陈智明
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2018-12-23
Filing date: 2019-12-06
Publication date: 2020-07-02
Also published as: EP3671893A1; ES2900656T3; US11641037B2; US20200203684A1; JP6911096B2; JP2020102448A; EP3671893B1; KR20210103930A; CN111354885A

Abstract

A battery module. The battery module comprises: a plurality of batteries (1) sequentially arranged along the length direction; a cushion pad (2) provided between every two adjacent batteries (1) along the length direction (L), the cushion pad (2) comprising a main body portion (21); and extension portions (22) extending outwards from end surfaces (211) of the main body portion (21) along the height direction (H), each extension portion (22) comprising a concave portion (221) and convex portions (222), wherein the convex portions (222) are located on the two sides of the extension portion (22) in the width direction (W) and protrude outwards, and the concave portion (221) is located between the convex portions (222) in the width direction (W) and concaves inwards relative to the convex portions (222). When the cushion pad (2) is subjected to an extrusion force along the length direction (L), the extrusion force on the cushion pad (2) is concentrated to the concave portions (221) and the convex portions (222) of the extension portions (22); the concave portions (221) of the extension portions (22) are stressed to deform and protrude outwards, and the deformation of the convex portions (222) located on the two sides of the concave portions (221) along the width direction (W) due to extrusion of the concave portions is larger than the deformation of the entire cushion pad (2) along the height direction (H) due to extrusion, thereby ensuring that the cushion pad (2) does not exceed the corresponding surface of the battery (1) along the height direction (H), and then the flatness of the corresponding surface of the battery (1) along the height direction (H) is not affected.

Description

Battery module

Technical field

This application relates to the field of batteries, in particular to a battery module.

Background technique

In the structure of the battery module, the cushion is used as a cushioning material and is arranged between the batteries. The shape of the existing buffer pad is rectangular or a frame with an opening in the middle. When pressed, the end surface of the buffer pad in the height direction may exceed the surface of the battery in the height direction, which may affect the outer size of the battery module and the battery edge. The flatness of the surface in the height direction. On the one hand, if you need to apply glue to the bottom of the battery module, if you use an existing buffer pad, when the buffer pad is pressed between the batteries by the assembly force of the battery module, the buffer pad will be pressed out of the battery in the height direction The bottom surface causes the bottom of the battery module to be uneven and the height of the adhesive layer to be uneven, resulting in inconsistent bonding strength of the battery and affecting the life of the battery module. On the other hand, in the case where a heat exchange plate is provided at the bottom of the battery module for heat exchange of the battery, the cushion pad exceeds the bottom surface of the battery in the height direction, which makes the bottom of the battery module uneven and affects the heat exchange efficiency.

Summary of the invention

In view of the defects in the prior art, the purpose of this application is to provide a battery module that does not affect the flatness of the corresponding surface of the battery in the height direction.

In order to achieve the above object, the present application provides a battery module, which includes: a plurality of batteries arranged in sequence along a length direction; a cushion pad disposed between two adjacent batteries along a length direction; the cushion pad includes: a body portion ; The extension portion extends outward from the end surface of the main body portion in the height direction, the extension portion includes a concave portion and a convex portion, the convex portion is located on both sides of the extension portion in the width direction and protrudes outward, and the concave portion is located between the convex portions in the width direction And the concave part is concave inward.

In one embodiment, the surface of the recess is a curved surface.

In one embodiment, the surface of the recess is flat.

In one embodiment, a chamfer or a rounded corner is provided between the convex portion and the concave portion.

In an embodiment, the angle between the end surface of the main body portion in the height direction and the extension portion is not greater than 90°.

In an embodiment, a chamfer or a rounded corner is provided between the end surface of the main body portion in the height direction and the extending portion.

In one embodiment, the height of the concave portion recessed inward in the height direction is smaller than the height of the convex portion protruding from the end surface of the main body portion in the height direction.

In one embodiment, the outer surface of the convex portion is a curved surface.

In one embodiment, the extending portion is provided on the lower end surface of the main body portion in the height direction.

In one embodiment, the extending portion is provided on the upper end surface of the main body portion in the height direction.

In one embodiment, both the upper end surface of the main body portion in the height direction and the lower end surface of the main body portion in the height direction are provided with extension portions.

In an embodiment, the extension portion provided at the upper end surface of the main body portion in the height direction and the extension portion provided at the lower end surface of the main body portion in the height direction are mirror-symmetric with respect to the main body portion.

In an embodiment, the battery module further includes a heat exchange plate, which is disposed and fixed on the lower side of the plurality of batteries in the height direction.

In one embodiment, the apex of the convex portion does not exceed the corresponding surface of the battery in the height direction.

The beneficial effects of the present application are as follows: When the cushion is subjected to compressive force in the longitudinal direction, the compressive force received by the cushion is concentrated to the concave and convex portions of the extension portion, the concave portion of the extension portion is deformed to protrude outward, and is located in the concave portion The convex parts on both sides are deformed by the concave parts in the width direction to be larger than the overall deformation of the cushion pad in the height direction, to ensure that the cushion pad does not exceed the corresponding surface of the battery in the height direction, and thus does not affect the battery in the height direction Corresponding to the flatness of the surface.

BRIEF DESCRIPTION

FIG. 1 is a partially exploded perspective view of the battery module of the present application.

2 is a perspective view of the battery module of FIG. 1 from another angle, where the heat exchange plate is not shown.

3 is an assembled perspective view of a battery and a cushion of the battery module of FIG. 1.

Fig. 4 is a side view of Fig. 3.

FIG. 5 is a perspective view of an embodiment of a cushion of the battery module of FIG. 1.

6 is a plan view of a cushion of the battery module of FIG. 5.

7 is a plan view of another embodiment of the cushion of the battery module.

Fig. 8 is an enlarged view of part A in Fig. 7, showing a modification of the extension of the cushion of the battery module.

FIG. 9 is an enlarged view of part A in FIG. 7, which shows another modification of the extension of the cushion of the battery module.

FIG. 10 is a plan view of still another embodiment of the cushion of the battery module.

Among them, the reference signs are described as follows:

1 Battery 22 extensions

11 Shell 221 recessed part

111 bottom side 222 convex part

112 big faces 3 heat exchange plates

12 Top cover G gap

121 top surface L length direction

13 pole column H height direction

14 Explosion-proof valve W width direction

2 Cushion pad P apex

21 Main body H1 height

211 end face H2 height

detailed description

The drawings illustrate embodiments of the present application, and it will be understood that the disclosed embodiments are merely examples of the present application, and the present application can be implemented in various forms, and therefore, specific details disclosed herein should not be interpreted as limiting Rather, it is only used as a basis for claims and as an expressive basis for teaching one of ordinary skill in the art to implement the application in various ways.

In the description of this specification, it should be understood that the directional terms such as “upper” and “lower” described in the embodiments of the present application are described from the angles shown in the drawings, and should not be understood as limited.

FIG. 1 is a partially exploded perspective view of the battery module of the present application. 2 is a perspective view of the battery module of FIG. 1 from another angle, where the heat exchange plate is not shown. 3 is an assembled perspective view of a battery and a cushion of the battery module of FIG. 1. Fig. 4 is a side view of Fig. 3. FIG. 5 is a perspective view of an embodiment of a cushion of the battery module of FIG. 1. 6 is a plan view of a cushion of the battery module of FIG. 5. 7 is a plan view of another embodiment of the cushion of the battery module. Fig. 8 is an enlarged view of part A in Fig. 7, which shows a modification of the extension of the cushion of the battery module. FIG. 9 is an enlarged view of part A in FIG. 7, which shows another modification of the extension of the cushion of the battery module. FIG. 10 is a plan view of still another embodiment of the cushion of the battery module.

The battery module of the present application includes: a plurality of batteries 1 arranged in sequence along the length direction L; and a buffer pad 2 disposed between two adjacent batteries 1 along the length direction L. The battery module further includes a heat exchange plate 3, which is arranged and fixed on the lower side of the plurality of batteries 1 along the height direction H.

The battery 1 is a hard-shell battery (or referred to as a can-type battery), and includes an electrode assembly (not shown), a case 11, a top cover 12, a pole 13, and an explosion-proof valve 14. The casing 11 includes a bottom surface 111 and a large surface 112, and a receiving cavity is formed inside the casing 11 to accommodate the electrode assembly and the electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator that separates the positive electrode sheet and the negative electrode sheet. In the electrode assembly, the positive electrode sheet, the negative electrode sheet, and the separator may be wound and formed, or the positive electrode sheet, the negative electrode sheet, and the separator may be laminated and formed. Both the positive electrode sheet and the negative electrode sheet include a current collector and an active material layer provided on the current collector.

In the example shown in the figure, the cushion 2 includes a body portion 21 and an extension portion 22; the extension portion 22 extends outward from the end surface 221 of the body portion 21 in the height direction H. The extending portion 22 includes a concave portion 221 and a convex portion 222. The convex portion 222 is located on both sides of the extended portion 22 in the width direction W and protrudes outward. The concave portion 221 is located between the convex portions 222 in the width direction W and is concave inward relative to the convex portion 222. Into. The term “outward” here refers to a direction toward the main body portion 21 and “inward” refers to a direction away from the main body portion 21.

When the cushion 2 receives a pressing force in the longitudinal direction L, due to the principle of minimum resistance during deformation, the extension 22 preferentially deforms and flows through the end surface 221 of the main body 21, and the pressing force received by the cushion 2 concentrates on the extension 22 The concave portion 221 and the convex portion 222, the concave portion 221 of the extension portion 22 is deformed by force and protrudes outward, the convex portions 222 on both sides of the concave portion 221 are pressed by the concave portion 221, and the deformation in the width direction W is greater than that of the entire cushion 2 The deformation along the height direction H ensures that the cushion pad 2 does not exceed the corresponding surface of the battery 1 along the height direction H (ie, the corresponding bottom surface 111 or top surface 121), and thus does not affect the flatness of the corresponding surface of the battery 1 along the height direction H Sex. The cushion pad 2 is usually made of an elastic compressible material, which can ensure that each battery 1 has sufficient expansion space to prevent lithium precipitation when the battery 1 is a lithium ion battery, and the cushion pad 2 can also play a role of heat insulation. The main body of the cushion 2 may have a flat structure.

There are many ways to provide the extension portion 22: Only the lower end surface 211 of the main body portion 21 along the height direction H may be provided with the extension portion 22. The extension portion 22 may be provided only on the upper end surface 211 of the main body portion 21 along the height direction H. As shown in FIGS. 1 to 7 and 10, the upper end surface 211 of the main body portion 21 in the height direction H and the lower end surface 211 of the main body portion 21 in the height direction H may be provided with extensions 22. The number of the extension portions 22 may be one or more. In the embodiments shown in FIGS. 1 to 7, the end surface 211 disposed on the lower side of the main body portion 21 along the height direction H and the end surface 211 disposed on the main body portion 21 along the height direction There are two extensions 22 on the upper end surface 211 of H. In the embodiment shown in FIG. 10, there are one extension 22 provided on the lower end surface 211 of the main body 21 along the height direction H, which is provided on There are two extension portions 22 of the upper end surface 211 of the main body portion 21 in the height direction H. The number of extensions 22 is not limited to this, and can be set according to specific needs, and the arrangement of the extensions 22 can also be selected according to design needs.

Referring to FIGS. 1 to 10, the lower end surface 211 of the main body portion 21 in the height direction H is provided with an extension portion 22. In the case of fixing the battery module by gluing the bottoms of the plurality of batteries 1, the cushion pad 2 receives the length When squeezed in the direction L, due to the presence of the concave portion 221 and the convex portion 222 of the extension portion 22, it is ensured that the lowest surface of the cushion pad 2 does not exceed the bottom surface 111 of the battery 1, which can ensure that the bottom adhesive layer of the battery 1 is flat and uniform To make the bonding strength uniform and firm, and the convex portion 222 of the extension portion 22 and the main body portion 21 are located at the lower end surface 211 along the height direction H to form a gap G, the gap G corresponds to the overflow space, when the bottom glue When it overflows to this place, when the battery module receives the impact force in the longitudinal direction L, the tangential force provided by the adhesive layer can reduce the impact force of the battery module. In the case where the heat exchange plates 3 are provided on the lower sides of the multiple batteries 1 to realize the heat exchange of the battery 1, the lowest surface of the cushion pad 2 does not exceed the bottom surface 111 of the battery 1 when pressed, and thus does not cause multiple batteries The bottom of 1 is not flat, so it will not reduce the heat exchange efficiency, excluding the impact of the cushion 2 on the heat exchange efficiency. The upper end surface 211 of the main body portion 21 along the height direction H is also provided with an extension portion 22. Due to the existence of the concave portion 221 and the convex portion 222 of the extension portion 22, the highest surface of the cushion pad 2 is ensured not to exceed the top surface 121 of the battery 1 , Does not interfere with the installation of other components of the battery module.

As shown in FIGS. 1 to 7, the extension portion 22 provided at the upper end surface 211 of the main body portion 21 in the height direction H and the extension portion 22 provided at the lower end surface 211 of the main body portion 21 in the height direction H are opposite to the main body The portion 21 is mirror-symmetrical, and even when the cushion 2 is installed upside down, it will not affect its use and improve versatility.

6 and 7, the angle φ between the end surface 211 of the main body portion 21 in the height direction H and the extension 22 is not greater than 90°, the angle φ in FIG. 6 is a right angle, and the angle φ in FIG. 7 is an acute angle . When the concave portion 221 is deformed and flowed due to the compression of the cushion 2, the concave portion 221 protrudes outward due to the deformed flow, the concave portion 221 tends to be flat, and the convex portions 222 on both sides of the concave portion 221 are more likely to be compressed by the concave portion 221 along the width The direction W is deformed to both sides, so that the displacement of the convex portion 222 in the height direction H is small, and it is reliably guaranteed that the apex P of the extension portion 22 of the cushion 2 does not exceed the corresponding surface of the battery 1 in the height direction H (that is, the corresponding The bottom surface 111 or the top surface 121) does not affect the flatness of the corresponding surface of the battery 1 in the height direction H.

Due to the limitation of the mold itself during molding, a chamfer or a rounded corner is provided between the end surface 211 of the main body 21 in the height direction H and the extension 22, as shown in FIGS. 4 to 10, the end surface 211 of the main body 21 in the height direction H A rounded corner is provided between the extension 22 and a chamfered or rounded corner can also avoid stress concentration at a sharp corner.

As shown in FIGS. 3 to 7 and FIGS. 9 and 10, the surface of the concave portion 221 may be a curved surface, as shown in FIG. 8, or a flat surface. When the cushion pad 2 is pressed, the surface of the arc surface deforms the concave portion 221 to protrude outward, and the convex portions 222 located on both sides of the concave portion 221 are compressed by the concave portion 221 to a greater extent than the convex portion 222 Due to the extent to which the entire cushion 2 is pressed and deformed upward or downward in the height direction H, it is reliably ensured that the apex P of the extending portion 22 of the cushion 2 does not exceed the corresponding surface of the battery 1 in the height direction H. The flat surface makes it easier to mold the recess 221, which reduces the processing difficulty and costs.

As shown in FIGS. 3 to 8 and FIG. 10, the outer surface of the convex portion 222 may be a curved surface, as shown in FIG. 9, or a flat surface. Taking the extension 22 provided on the lower end surface 211 of the main body 21 in the height direction H as an example, the flat outer surface makes the convex portion 222 contact with the bottom of the battery module more flat, although the outer surface of the arc surface makes The contact area of the convex portion 222 and the bottom of the battery module is small, and the contact flatness is not as good as the flat outer surface, but the outer surface of the arc surface is favorable for guiding the overflow of the glue when the bottom is coated with glue.

As shown in FIG. 8, the surface of the concave portion 221 is a flat surface, a rounded corner is provided between the convex portion 222 and the concave portion 221, and a chamfer can also be provided between the convex portion 222 and the concave portion 221 to prevent a sudden change in size resulting in stress concentration The phenomenon, improve the service life of the cushion 2.

Referring to FIG. 7, the height H1 of the concave portion 221 recessed inward in the height direction H is smaller than the height H2 of the convex portion 222 protruding from the end surface 211 of the body portion 21 in the height direction H. The existence of such a height difference satisfies that the concave portion 221 does not exceed the convex portion 222 when protruding outward in the height direction H at the time of pressing, and does not exceed the corresponding surface of the battery 1 in the height direction H, and can ensure the protrusion strength.

When designing and installing the cushion 2, the apex P of the convex portion 222 of the extension 22 of the cushion 2 does not exceed the corresponding surface of the battery 1 in the height direction H (ie, corresponding to the bottom surface 111 or the top surface 121 ).

In summary, when the cushion 2 receives a pressing force in the longitudinal direction L, the pressing force received by the cushion 2 concentrates on the concave portion 221 and the convex portion 222 of the extending portion 22, and the concave portion 221 of the extending portion 22 is deformed by force Protruding outward, the convex portions 222 located on both sides of the concave portion 221 are deformed by the concave portion 221 in the width direction W more than the deformation of the entire cushion 2 in the height direction H, to ensure that the cushion 2 does not exceed the battery 1 along the height The corresponding surface in the direction H does not affect the flatness of the corresponding surface of the battery 1 in the height direction H.

The above detailed description describes various exemplary embodiments, but this document is not intended to be limited to the explicitly disclosed combinations. Therefore, unless stated otherwise, the various features disclosed herein may be combined together to form multiple additional combinations not shown for simplicity.

The above are only the preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of this application shall be included in the scope of protection of this application.

Claims

A battery module includes:

Multiple batteries (1) are arranged in sequence along the length direction (L);

The cushion pad (2) is arranged between two adjacent batteries (1) along the length direction (L);

The cushion (2) includes:

Main body (21);

The extending portion (22) extends outward from the end surface (221) of the main body portion (21) along the height direction (H). The extending portion (22) includes a concave portion (221) and a convex portion (222), and the convex portion (222) The width direction (W) is located on both sides of the extending portion (22) and protrudes outward. The concave portion (221) is located between the convex portions (222) along the width direction (W) and is recessed inward relative to the convex portion (222).
The battery module according to claim 1, wherein the surface of the concave portion (221) is a curved surface.
The battery module according to claim 1, wherein the surface of the recess (221) is flat.
The battery module according to claim 1, wherein a chamfer or a rounded corner is provided between the convex portion (222) and the concave portion (221).
The battery module according to claim 1, wherein the angle (φ) between the end surface (211) of the main body portion (21) in the height direction (H) and the extending portion (22) is not greater than 90°.
The battery module according to claim 1 or 5, wherein a chamfer or a rounded corner is provided between the end surface (211) of the main body portion (21) in the height direction (H) and the extension portion (22).
The battery module according to claim 1, wherein the height (H1) of the concave portion (221) recessed inward along the height direction (H) is smaller than that of the convex portion (222) from the main body portion (21) in the height direction ( The height (H2) of the end face (211) of H).
The battery module according to claim 1, wherein the outer surface of the convex portion (222) is a curved surface.
The battery module according to claim 1, wherein the extending portion (22) is provided on an end surface (211) on the lower side of the main body portion (21) in the height direction (H).
The battery module according to claim 1, wherein the extending portion (22) is provided on an upper end surface (211) of the main body portion (21) along the height direction (H).
The battery module according to claim 1, wherein:

The upper end surface (211) of the main body portion (21) in the height direction (H) and the lower end surface (211) of the main body portion (21) in the height direction (H) are each provided with an extension portion (22).
The battery module according to claim 11, wherein:

The extension portion (22) provided on the upper end surface (211) of the main body portion (21) along the height direction (H) and the end surface (211) provided on the lower side of the main body portion (21) along the height direction (H) The extension portion (22) is mirror-symmetric with respect to the main body portion (21).
The battery module according to claim 9, wherein the battery module further comprises:

The heat exchange plate (3) is arranged and fixed on the lower side of the plurality of batteries (1) in the height direction (H).
The battery module according to claim 1, wherein the apex (P) of the convex portion (222) does not exceed the corresponding surface of the battery (1) in the height direction (H).